Stemless humeral component of an orthopaedic shoulder prosthesis
A stemless humeral component for replacing the humeral head of a patient's humerus includes a support flange having a number of cantilevered legs extending distally away from a bottom surface thereof. Instruments and methods for surgically installing the stemless humeral component are also disclosed.
1. An orthopaedic shoulder prosthesis for replacing the humeral head of a patient's humerus, comprising:
a stemless humeral component comprising (i) a circular-shaped flange, (ii) an elongated sleeve, secured to, and extending laterally away from a bottom surface of the circular-shaped flange, the elongated sleeve having formed therein a tapered bore configured to receive a tapered post of a humeral head component, and (iii) a plurality of cantilevered legs extending laterally away from the bottom surface of the circular-shaped flange in the same direction as the elongated sleeve,
wherein each cantilevered leg has a first end secured to the bottom surface of the circular-shaped flange and a free second end that is spaced apart and detached from the other cantilevered legs and the elongated sleeve, and
wherein each of the cantilevered legs comprises (i) a bone-engaging plate having a first side that faces outwardly from the elongated sleeve, (ii) an elongated rib secured to an opposite, second side of the bone-engaging plate and extending laterally in the same direction as the elongated sleeve and inwardly from the bone-engaging plate in a direction toward the elongated sleeve, and a plurality of serrations formed on the first side of the bone-engaging plate.
2. The orthopaedic shoulder prosthesis of claim 1 , wherein each of the plurality of serrations is angled upwardly in a direction toward the circular-shaped flange.
3. The orthopaedic shoulder prosthesis of claim 1 , wherein:
the circular-shaped flange has a number of revision slots formed therein, and
each of the revision slots is positioned on the circular-shaped flange at a location above, and radially outwardly from, one of the cantilevered legs.
4. The orthopaedic shoulder prosthesis of claim 1 , wherein:
the elongated sleeve has a threaded bore formed therein, and
the threaded bore extends medially away from a distal end of the elongated sleeve and opens into the tapered bore.
5. The orthopaedic shoulder prosthesis of claim 1 , wherein the circular-shaped flange has a number of viewing windows formed therein at a radial location between the elongated sleeve and the plurality of cantilevered legs.
6. An orthopaedic shoulder prosthesis for replacing the humeral head of a patient's humerus, comprising:
a humeral head component comprising (i) a generally hemispherically-shaped bearing surface, and (ii) a backside surface opposite the bearing surface, and (iii) a tapered post extending laterally away from the backside surface, and
a stemless humeral component comprising (i) a circular-shaped flange, (ii) an elongated sleeve, secured to, and extending laterally away from a bottom surface of the circular-shaped flange, the elongated sleeve having formed therein a tapered bore configured to receive the tapered post of the humeral head component, and (iii) a plurality of cantilevered legs extending laterally away from the bottom surface of the circular-shaped flange in the same direction as the elongated sleeve,
wherein each cantilevered leg has one end thereof secured to the bottom surface of the circular-shaped flange and a free second end that is spaced apart and detached from the other cantilevered legs and the elongated sleeve,
wherein each cantilevered leg comprises (i) a bone-engaging plate having an outwardly-facing first side and an inwardly-facing second side positioned opposite the first side, (ii) a plurality of serrations formed on the first side of the bone-engaging plate, and (iii) an elongated rib secured to the second side of the bone-engaging plate and extending inwardly therefrom in a direction toward the elongated sleeve such that the elongated rib extends in a direction opposite from the plurality of serrated ribs.
7. The orthopaedic shoulder prosthesis of claim 6 , wherein each of the plurality of serrations is angled upwardly in a direction toward the circular-shaped flange.
8. The orthopaedic shoulder prosthesis of claim 6 , wherein:
the circular-shaped flange has a number of revision slots formed therein, and
each of the revision slots is positioned on the circular-shaped flange at a location above, and radially outwardly from, one of the cantilevered legs.
9. The orthopaedic shoulder prosthesis of claim 6 , wherein:
the elongated sleeve has a threaded bore formed therein, and
the threaded bore extends medially away from a distal end of the elongated sleeve and opens into the tapered bore.
10. The orthopaedic shoulder prosthesis of claim 6 , wherein the circular-shaped flange has a number of viewing windows formed therein at a radial location between the elongated sleeve and the plurality of cantilevered legs.
11. The orthopaedic shoulder prosthesis of claim 6 , wherein the plurality of cantilevered legs extend generally parallel to each other.
12. An orthopaedic shoulder prosthesis for replacing the humeral head of a patient's humerus, comprising:
a humeral head component comprising (i) a generally hemispherically-shaped bearing surface, and (ii) a backside surface opposite the bearing surface, and (iii) a tapered post extending laterally away from the backside surface, and
a stemless humeral component comprising (i) a circular-shaped flange, (ii) an elongated sleeve, secured to, and extending laterally away from a bottom surface of the circular-shaped flange, the elongated sleeve having formed therein a tapered bore configured to receive the tapered post of the humeral head component, and (iii) a plurality of cantilevered legs extending laterally away from the bottom surface of the circular-shaped flange in the same direction as the elongated sleeve,
wherein one end of each cantilevered leg is secured to the bottom surface of the circular-shaped flange, and each cantilevered leg has a free second end that is spaced apart and detached from the other cantilevered legs and the elongated sleeve,
wherein each cantilevered leg comprises (i) a bone-engaging plate having a first side that faces outwardly from the elongated sleeve, (ii) an elongated rib secured to an opposite, second side of the bone-engaging plate and extending laterally in the same direction as the elongated sleeve, orthogonally away from the second side of the bone-engaging plate, and inwardly from the bone-engaging plate in a direction toward the elongated sleeve, and (iii) a plurality of serrations formed on the first side of the bone-engaging plate.
13. The orthopaedic shoulder prosthesis of claim 12 , wherein each of the plurality of serrations is angled upwardly in a direction toward the circular-shaped flange.
14. The orthopaedic shoulder prosthesis of claim 12 , wherein:
the circular-shaped flange has a number of revision slots formed therein, and
each of the revision slots is positioned on the circular-shaped flange at a location above, and radially outwardly from, one of the cantilevered legs.
15. The orthopaedic shoulder prosthesis of claim 12 , wherein:
the elongated sleeve has a threaded bore formed therein, and
the threaded bore extends medially away from a distal end of the elongated sleeve and opens into the tapered bore.
16. The orthopaedic shoulder prosthesis of claim 12 , wherein the circular-shaped flange has a number of viewing windows formed therein at a radial location between the elongated sleeve and the plurality of cantilevered legs.